Above code snippet will give you outputImage with increased brightness and contrast. You can further refer example project.

Documentation

Although there are few inbuilt filters already present, you may want to create and customize one specific to your need and show your creativity. For that you would require to know how all the Subfilters can be used. Let me take you through all of them.

ToneCurveSubfilter

This is most awesome filter present in this library which differentiates PhotoFiltersSDK from other image processing libraries out there. ToneCurveSubFilter applies the changed RGB Channel curve to create effect on image.